关闭了这个窗口后程序直接退出了

Question

import javax.swing.*;
import java.awt.*;
public class registerok_ui {
    public registerok_ui() {
        JFrame frame = new JFrame("注册成功");
        frame.setDefaultCloseOperation(3); //当关闭当前窗口时，不退出整个程序
        frame.setBounds(500, 100, 600, 600);
        JPanel panel = new JPanel(new GridBagLayout());
        frame.setContentPane(panel);
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.fill = GridBagConstraints.NONE;
        constraints.anchor = GridBagConstraints.WEST;
        constraints.insets = new Insets(10, 10, 10, 10);
        JLabel text1 = new JLabel("注册成功");
        constraints.gridx = 0;
        constraints.gridy = 0;
        panel.add(text1, constraints);
        frame.setVisible(true);
    }
}

关闭了这个窗口后程序直接退出了，怎么解决？

Answer 1

import javax.swing.*;
import java.awt.*;

public class RegisterOkUI {
    public RegisterOkUI() {
        JFrame frame = new JFrame("注册成功");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); // 设置关闭操作为销毁窗口而不退出程序
        frame.setBounds(500, 100, 600, 600);
        JPanel panel = new JPanel(new GridBagLayout());
        frame.setContentPane(panel);
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.fill = GridBagConstraints.NONE;
        constraints.anchor = GridBagConstraints.WEST;
        constraints.insets = new Insets(10, 10, 10, 10);
        JLabel text1 = new JLabel("注册成功");
        constraints.gridx = 0;
        constraints.gridy = 0;
        panel.add(text1, constraints);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        new RegisterOkUI();
    }
}